diff --git a/.github/workflows/appengine_deploy.yml b/.github/workflows/appengine_deploy.yml
index 72cee90bf..f7098d53a 100644
--- a/.github/workflows/appengine_deploy.yml
+++ b/.github/workflows/appengine_deploy.yml
@@ -42,7 +42,7 @@ jobs:
           path: _deploy/
 
       - name: Deploy to App Engine
-        uses: google-github-actions/deploy-appengine@v2.0.0
+        uses: google-github-actions/deploy-appengine@v2.1.0
         # For parameters see:
         # https://github.com/google-github-actions/deploy-appengine#inputs
         with:
diff --git a/appengine/add_timestamps.py b/appengine/add_timestamps.py
index af877f3d6..05ff7b928 100644
--- a/appengine/add_timestamps.py
+++ b/appengine/add_timestamps.py
@@ -62,8 +62,8 @@ def run_query():
     while more:
       results, cursor, more = query.fetch_page(PAGE_SIZE, start_cursor=cursor)
       handle_results(results)
-      page_count = page_count + 1
-      result_count = result_count + len(results)
+      page_count += 1
+      result_count += len(results)
       print(f'{datetime.datetime.now().strftime("%I:%M:%S %p")} : page {page_count} : {result_count}')
 
 run_query()
diff --git a/core/block_animations.ts b/core/block_animations.ts
index 615aa81d1..d3bd13118 100644
--- a/core/block_animations.ts
+++ b/core/block_animations.ts
@@ -38,18 +38,26 @@ export function disposeUiEffect(block: BlockSvg) {
   const svgGroup = block.getSvgRoot();
   workspace.getAudioManager().play('delete');
 
-  const xy = workspace.getSvgXY(svgGroup);
+  const xy = block.getRelativeToSurfaceXY();
   // Deeply clone the current block.
   const clone: SVGGElement = svgGroup.cloneNode(true) as SVGGElement;
   clone.setAttribute('transform', 'translate(' + xy.x + ',' + xy.y + ')');
-  workspace.getParentSvg().appendChild(clone);
+  if (workspace.isDragging()) {
+    workspace.getLayerManager()?.moveToDragLayer({
+      getSvgRoot: () => {
+        return clone;
+      },
+    });
+  } else {
+    workspace.getLayerManager()?.getBlockLayer().appendChild(clone);
+  }
   const cloneRect = {
     'x': xy.x,
     'y': xy.y,
     'width': block.width,
     'height': block.height,
   };
-  disposeUiStep(clone, cloneRect, workspace.RTL, new Date(), workspace.scale);
+  disposeUiStep(clone, cloneRect, workspace.RTL, new Date());
 }
 /**
  * Animate a cloned block and eventually dispose of it.
@@ -60,29 +68,26 @@ export function disposeUiEffect(block: BlockSvg) {
  * @param rect Starting rect of the clone.
  * @param rtl True if RTL, false if LTR.
  * @param start Date of animation's start.
- * @param workspaceScale Scale of workspace.
  */
 function disposeUiStep(
   clone: Element,
   rect: CloneRect,
   rtl: boolean,
   start: Date,
-  workspaceScale: number,
 ) {
   const ms = new Date().getTime() - start.getTime();
   const percent = ms / 150;
   if (percent > 1) {
     dom.removeNode(clone);
   } else {
-    const x =
-      rect.x + (((rtl ? -1 : 1) * rect.width * workspaceScale) / 2) * percent;
-    const y = rect.y + rect.height * workspaceScale * percent;
-    const scale = (1 - percent) * workspaceScale;
+    const x = rect.x + (((rtl ? -1 : 1) * rect.width) / 2) * percent;
+    const y = rect.y + (rect.height / 2) * percent;
+    const scale = 1 - percent;
     clone.setAttribute(
       'transform',
       'translate(' + x + ',' + y + ')' + ' scale(' + scale + ')',
     );
-    setTimeout(disposeUiStep, 10, clone, rect, rtl, start, workspaceScale);
+    setTimeout(disposeUiStep, 10, clone, rect, rtl, start);
   }
 }
 
diff --git a/core/connection.ts b/core/connection.ts
index 56bf4c3e7..1dd8dc1ea 100644
--- a/core/connection.ts
+++ b/core/connection.ts
@@ -224,7 +224,7 @@ export class Connection implements IASTNodeLocationWithBlock {
    * Connect this connection to another connection.
    *
    * @param otherConnection Connection to connect to.
-   * @returns Whether the the blocks are now connected or not.
+   * @returns Whether the blocks are now connected or not.
    */
   connect(otherConnection: Connection): boolean {
     if (this.targetConnection === otherConnection) {
diff --git a/core/field_variable.ts b/core/field_variable.ts
index 95474e4b1..539557256 100644
--- a/core/field_variable.ts
+++ b/core/field_variable.ts
@@ -444,7 +444,6 @@ export class FieldVariable extends FieldDropdown {
     // #1499.
     // Set the allowable variable types.  Null means all types on the workspace.
     if (Array.isArray(variableTypes)) {
-      variableTypes = variableTypes;
       // Make sure the default type is valid.
       let isInArray = false;
       for (let i = 0; i < variableTypes.length; i++) {
diff --git a/core/generator.ts b/core/generator.ts
index a24a04697..7bb509f8b 100644
--- a/core/generator.ts
+++ b/core/generator.ts
@@ -303,6 +303,9 @@ export class CodeGenerator {
       throw TypeError('Expecting valid order from block: ' + block.type);
     }
     const targetBlock = block.getInputTargetBlock(name);
+    if (!targetBlock && !block.getInput(name)) {
+      throw ReferenceError(`Input "${name}" doesn't exist on "${block.type}"`);
+    }
     if (!targetBlock) {
       return '';
     }
@@ -381,6 +384,9 @@ export class CodeGenerator {
    */
   statementToCode(block: Block, name: string): string {
     const targetBlock = block.getInputTargetBlock(name);
+    if (!targetBlock && !block.getInput(name)) {
+      throw ReferenceError(`Input "${name}" doesn't exist on "${block.type}"`);
+    }
     let code = this.blockToCode(targetBlock);
     // Value blocks must return code and order of operations info.
     // Statement blocks must only return code.
diff --git a/core/registry.ts b/core/registry.ts
index 69b800504..385f1240c 100644
--- a/core/registry.ts
+++ b/core/registry.ts
@@ -165,8 +165,13 @@ export function register<T>(
   // Validate that the given class has all the required properties.
   validate(type, registryItem);
 
-  // Don't throw an error if opt_allowOverrides is true.
-  if (!opt_allowOverrides && typeRegistry[caselessName]) {
+  // Don't throw an error if opt_allowOverrides is true,
+  // or if we're trying to register the same item.
+  if (
+    !opt_allowOverrides &&
+    typeRegistry[caselessName] &&
+    typeRegistry[caselessName] !== registryItem
+  ) {
     throw Error(
       'Name "' +
         caselessName +
diff --git a/core/render_management.ts b/core/render_management.ts
index 8a1d9407b..3e84efead 100644
--- a/core/render_management.ts
+++ b/core/render_management.ts
@@ -170,7 +170,7 @@ function dequeueBlock(block: BlockSvg) {
  * No need to render dead blocks.
  *
  * No need to render blocks with parents. A render for the block may have been
- * queued, and the the block was connected to a parent, so it is no longer a
+ * queued, and the block was connected to a parent, so it is no longer a
  * root block. Rendering will be triggered through the real root block.
  */
 function shouldRenderRootBlock(block: BlockSvg): boolean {
diff --git a/core/serialization/workspaces.ts b/core/serialization/workspaces.ts
index 07c909ccf..871060196 100644
--- a/core/serialization/workspaces.ts
+++ b/core/serialization/workspaces.ts
@@ -75,8 +75,7 @@ export function load(
   }
 
   // reverse() is destructive, so we have to re-reverse to correct the order.
-  for (let [name, deserializer] of deserializers.reverse()) {
-    name = name;
+  for (const [name, deserializer] of deserializers.reverse()) {
     const pluginState = state[name];
     if (pluginState) {
       (deserializer as ISerializer)?.load(state[name], workspace);
diff --git a/core/shortcut_registry.ts b/core/shortcut_registry.ts
index 35f409b48..161a2ed14 100644
--- a/core/shortcut_registry.ts
+++ b/core/shortcut_registry.ts
@@ -287,7 +287,7 @@ export class ShortcutRegistry {
       }
     }
     if (serializedKey !== '' && e.keyCode) {
-      serializedKey = serializedKey + '+' + e.keyCode;
+      serializedKey += '+' + e.keyCode;
     } else if (e.keyCode) {
       serializedKey = String(e.keyCode);
     }
@@ -335,7 +335,7 @@ export class ShortcutRegistry {
     }
 
     if (serializedKey !== '' && keyCode) {
-      serializedKey = serializedKey + '+' + keyCode;
+      serializedKey += '+' + keyCode;
     } else if (keyCode) {
       serializedKey = `${keyCode}`;
     }
diff --git a/core/utils/svg_math.ts b/core/utils/svg_math.ts
index 88d38f625..0444787ad 100644
--- a/core/utils/svg_math.ts
+++ b/core/utils/svg_math.ts
@@ -87,8 +87,8 @@ export function getInjectionDivXY(element: Element): Coordinate {
   let y = 0;
   while (element) {
     const xy = getRelativeXY(element);
-    x = x + xy.x;
-    y = y + xy.y;
+    x += xy.x;
+    y += xy.y;
     const classes = element.getAttribute('class') || '';
     if ((' ' + classes + ' ').includes(' injectionDiv ')) {
       break;
diff --git a/core/widgetdiv.ts b/core/widgetdiv.ts
index 52816f363..e03cf0b25 100644
--- a/core/widgetdiv.ts
+++ b/core/widgetdiv.ts
@@ -57,14 +57,16 @@ export function testOnly_setDiv(newDiv: HTMLDivElement | null) {
  * Create the widget div and inject it onto the page.
  */
 export function createDom() {
+  const container = common.getParentContainer() || document.body;
+
   if (document.querySelector('.' + containerClassName)) {
-    return; // Already created.
+    containerDiv = document.querySelector('.' + containerClassName);
+  } else {
+    containerDiv = document.createElement('div') as HTMLDivElement;
+    containerDiv.className = containerClassName;
   }
 
-  containerDiv = document.createElement('div') as HTMLDivElement;
-  containerDiv.className = containerClassName;
-  const container = common.getParentContainer() || document.body;
-  container.appendChild(containerDiv);
+  container.appendChild(containerDiv!);
 }
 
 /**
diff --git a/core/xml.ts b/core/xml.ts
index b24dd0c28..7746fd1e4 100644
--- a/core/xml.ts
+++ b/core/xml.ts
@@ -946,7 +946,7 @@ function applyNextTagNodes(
  *
  * @param xmlBlock XML block element.
  * @param workspace The workspace.
- * @param parentConnection The parent connection to to connect this block to
+ * @param parentConnection The parent connection to connect this block to
  *     after instantiating.
  * @param connectedToParentNext Whether the provided parent connection is a next
  *     connection, rather than output or statement.
diff --git a/demos/blockfactory/block_definition_extractor.js b/demos/blockfactory/block_definition_extractor.js
index e6b1cedd6..fa1aae775 100644
--- a/demos/blockfactory/block_definition_extractor.js
+++ b/demos/blockfactory/block_definition_extractor.js
@@ -71,7 +71,7 @@ BlockDefinitionExtractor.newDomElement_ = function(name, opt_attrs, opt_text) {
  * requested type.
  *
  * @param {string} type Type name of desired connection constraint.
- * @return {!Element} The <block> representing the the constraint type.
+ * @return {!Element} The <block> representing the constraint type.
  * @private
  */
 BlockDefinitionExtractor.buildBlockForType_ = function(type) {
diff --git a/demos/code/index.html b/demos/code/index.html
index a1a8661ec..d8f894607 100644
--- a/demos/code/index.html
+++ b/demos/code/index.html
@@ -350,44 +350,6 @@
       </block>
       <block type="lists_sort"></block>
     </category>
-    <category name="%{BKY_CATCOLOUR}" colour="%{BKY_COLOUR_HUE}">
-      <block type="colour_picker"></block>
-      <block type="colour_random"></block>
-      <block type="colour_rgb">
-        <value name="RED">
-          <shadow type="math_number">
-            <field name="NUM">100</field>
-          </shadow>
-        </value>
-        <value name="GREEN">
-          <shadow type="math_number">
-            <field name="NUM">50</field>
-          </shadow>
-        </value>
-        <value name="BLUE">
-          <shadow type="math_number">
-            <field name="NUM">0</field>
-          </shadow>
-        </value>
-      </block>
-      <block type="colour_blend">
-        <value name="COLOUR1">
-          <shadow type="colour_picker">
-            <field name="COLOUR">#ff0000</field>
-          </shadow>
-        </value>
-        <value name="COLOUR2">
-          <shadow type="colour_picker">
-            <field name="COLOUR">#3333ff</field>
-          </shadow>
-        </value>
-        <value name="RATIO">
-          <shadow type="math_number">
-            <field name="NUM">0.5</field>
-          </shadow>
-        </value>
-      </block>
-    </category>
     <sep></sep>
     <category name="%{BKY_CATVARIABLES}" colour="%{BKY_VARIABLES_HUE}" custom="VARIABLE"></category>
     <category name="%{BKY_CATFUNCTIONS}" colour="%{BKY_PROCEDURES_HUE}" custom="PROCEDURE"></category>
diff --git a/generators/dart/procedures.ts b/generators/dart/procedures.ts
index 5102432ad..0ecf6d210 100644
--- a/generators/dart/procedures.ts
+++ b/generators/dart/procedures.ts
@@ -35,8 +35,17 @@ export function procedures_defreturn(block: Block, generator: DartGenerator) {
       generator.INDENT,
     );
   }
-  const branch = generator.statementToCode(block, 'STACK');
-  let returnValue = generator.valueToCode(block, 'RETURN', Order.NONE) || '';
+  let branch = '';
+  if (block.getInput('STACK')) {
+    // The 'procedures_defreturn' block might not have a STACK input.
+    branch = generator.statementToCode(block, 'STACK');
+  }
+  let returnValue = '';
+  if (block.getInput('RETURN')) {
+    // The 'procedures_defnoreturn' block (which shares this code)
+    // does not have a RETURN input.
+    returnValue = generator.valueToCode(block, 'RETURN', Order.NONE) || '';
+  }
   let xfix2 = '';
   if (branch && returnValue) {
     // After executing the function body, revisit this block for the return.
diff --git a/generators/dart/text.ts b/generators/dart/text.ts
index 1d9e8dca7..c141eaad0 100644
--- a/generators/dart/text.ts
+++ b/generators/dart/text.ts
@@ -118,10 +118,12 @@ export function text_charAt(
       return [code, Order.UNARY_POSTFIX];
     }
     case 'LAST':
-      at = 1;
-    // Fall through.
     case 'FROM_END': {
-      at = generator.getAdjusted(block, 'AT', 1);
+      if (where === 'LAST') {
+        at = 1;
+      } else {
+        at = generator.getAdjusted(block, 'AT', 1);
+      }
       const functionName = generator.provideFunction_(
         'text_get_from_end',
         `
@@ -130,7 +132,7 @@ String ${generator.FUNCTION_NAME_PLACEHOLDER_}(String text, num x) {
 }
 `,
       );
-      const code = functionName + '(' + text + ', ' + at + ')';
+      const code = `${functionName}(${text}, ${at})`;
       return [code, Order.UNARY_POSTFIX];
     }
     case 'RANDOM': {
diff --git a/generators/javascript/math.ts b/generators/javascript/math.ts
index e8ab2852f..238ad19a2 100644
--- a/generators/javascript/math.ts
+++ b/generators/javascript/math.ts
@@ -318,7 +318,7 @@ function ${generator.FUNCTION_NAME_PLACEHOLDER_}(values) {
   }
   for (var j = 0; j < counts.length; j++) {
     if (counts[j][1] === maxCount) {
-        modes.push(counts[j][0]);
+      modes.push(counts[j][0]);
     }
   }
   return modes;
@@ -341,7 +341,7 @@ function ${generator.FUNCTION_NAME_PLACEHOLDER_}(numbers) {
   for (var j = 0; j < n; j++) {
     variance += Math.pow(numbers[j] - mean, 2);
   }
-  variance = variance / n;
+  variance /= n;
   return Math.sqrt(variance);
 }
 `,
diff --git a/generators/javascript/procedures.ts b/generators/javascript/procedures.ts
index a835271e7..e0a055217 100644
--- a/generators/javascript/procedures.ts
+++ b/generators/javascript/procedures.ts
@@ -38,8 +38,17 @@ export function procedures_defreturn(
       generator.INDENT,
     );
   }
-  const branch = generator.statementToCode(block, 'STACK');
-  let returnValue = generator.valueToCode(block, 'RETURN', Order.NONE) || '';
+  let branch = '';
+  if (block.getInput('STACK')) {
+    // The 'procedures_defreturn' block might not have a STACK input.
+    branch = generator.statementToCode(block, 'STACK');
+  }
+  let returnValue = '';
+  if (block.getInput('RETURN')) {
+    // The 'procedures_defnoreturn' block (which shares this code)
+    // does not have a RETURN input.
+    returnValue = generator.valueToCode(block, 'RETURN', Order.NONE) || '';
+  }
   let xfix2 = '';
   if (branch && returnValue) {
     // After executing the function body, revisit this block for the return.
diff --git a/generators/lua/procedures.ts b/generators/lua/procedures.ts
index 07003aee9..79dc58aa2 100644
--- a/generators/lua/procedures.ts
+++ b/generators/lua/procedures.ts
@@ -38,8 +38,17 @@ export function procedures_defreturn(
       generator.INDENT,
     );
   }
-  let branch = generator.statementToCode(block, 'STACK');
-  let returnValue = generator.valueToCode(block, 'RETURN', Order.NONE) || '';
+  let branch = '';
+  if (block.getInput('STACK')) {
+    // The 'procedures_defreturn' block might not have a STACK input.
+    branch = generator.statementToCode(block, 'STACK');
+  }
+  let returnValue = '';
+  if (block.getInput('RETURN')) {
+    // The 'procedures_defnoreturn' block (which shares this code)
+    // does not have a RETURN input.
+    returnValue = generator.valueToCode(block, 'RETURN', Order.NONE) || '';
+  }
   let xfix2 = '';
   if (branch && returnValue) {
     // After executing the function body, revisit this block for the return.
diff --git a/generators/lua/text.ts b/generators/lua/text.ts
index 7e3bb8794..1c4a79a8e 100644
--- a/generators/lua/text.ts
+++ b/generators/lua/text.ts
@@ -122,8 +122,6 @@ export function text_charAt(
   // Get letter at index.
   // Note: Until January 2013 this block did not have the WHERE input.
   const where = block.getFieldValue('WHERE') || 'FROM_START';
-  const atOrder = where === 'FROM_END' ? Order.UNARY : Order.NONE;
-  const at = generator.valueToCode(block, 'AT', atOrder) || '1';
   const text = generator.valueToCode(block, 'VALUE', Order.NONE) || "''";
   let code;
   if (where === 'RANDOM') {
@@ -144,6 +142,8 @@ end
     } else if (where === 'LAST') {
       start = '-1';
     } else {
+      const atOrder = where === 'FROM_END' ? Order.UNARY : Order.NONE;
+      const at = generator.valueToCode(block, 'AT', atOrder) || '1';
       if (where === 'FROM_START') {
         start = at;
       } else if (where === 'FROM_END') {
diff --git a/generators/php/procedures.ts b/generators/php/procedures.ts
index bd114cd0d..acf84aea6 100644
--- a/generators/php/procedures.ts
+++ b/generators/php/procedures.ts
@@ -60,8 +60,17 @@ export function procedures_defreturn(block: Block, generator: PhpGenerator) {
       generator.INDENT,
     );
   }
-  const branch = generator.statementToCode(block, 'STACK');
-  let returnValue = generator.valueToCode(block, 'RETURN', Order.NONE) || '';
+  let branch = '';
+  if (block.getInput('STACK')) {
+    // The 'procedures_defreturn' block might not have a STACK input.
+    branch = generator.statementToCode(block, 'STACK');
+  }
+  let returnValue = '';
+  if (block.getInput('RETURN')) {
+    // The 'procedures_defnoreturn' block (which shares this code)
+    // does not have a RETURN input.
+    returnValue = generator.valueToCode(block, 'RETURN', Order.NONE) || '';
+  }
   let xfix2 = '';
   if (branch && returnValue) {
     // After executing the function body, revisit this block for the return.
diff --git a/generators/python/procedures.ts b/generators/python/procedures.ts
index 798d6d55a..51d2ee9a3 100644
--- a/generators/python/procedures.ts
+++ b/generators/python/procedures.ts
@@ -60,8 +60,17 @@ export function procedures_defreturn(block: Block, generator: PythonGenerator) {
       generator.INDENT,
     );
   }
-  let branch = generator.statementToCode(block, 'STACK');
-  let returnValue = generator.valueToCode(block, 'RETURN', Order.NONE) || '';
+  let branch = '';
+  if (block.getInput('STACK')) {
+    // The 'procedures_defreturn' block might not have a STACK input.
+    branch = generator.statementToCode(block, 'STACK');
+  }
+  let returnValue = '';
+  if (block.getInput('RETURN')) {
+    // The 'procedures_defnoreturn' block (which shares this code)
+    // does not have a RETURN input.
+    returnValue = generator.valueToCode(block, 'RETURN', Order.NONE) || '';
+  }
   let xfix2 = '';
   if (branch && returnValue) {
     // After executing the function body, revisit this block for the return.
diff --git a/package-lock.json b/package-lock.json
index 1b9b0c493..184e0a780 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -19,7 +19,7 @@
         "@hyperjump/json-schema": "^1.5.0",
         "@microsoft/api-documenter": "^7.22.4",
         "@microsoft/api-extractor": "^7.29.5",
-        "@typescript-eslint/eslint-plugin": "^6.1.0",
+        "@typescript-eslint/eslint-plugin": "^7.3.1",
         "async-done": "^2.0.0",
         "chai": "^4.2.0",
         "concurrently": "^8.0.1",
@@ -78,9 +78,9 @@
       }
     },
     "node_modules/@blockly/block-test": {
-      "version": "5.0.4",
-      "resolved": "https://registry.npmjs.org/@blockly/block-test/-/block-test-5.0.4.tgz",
-      "integrity": "sha512-3u7z9Xd+W1eCcknqVsmUYnDvS2FIzce2IdGuRC1lst2XIQQ59q2wkUqGg4+Z2Arr3hk/TpIlHn2YLrGPkvqkug==",
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/@blockly/block-test/-/block-test-5.1.0.tgz",
+      "integrity": "sha512-beqBTJbrrDGECohJo6uczeLAvRxKgMFn9Ew1po6d8PBka/aNwSkT33jHRUAeasHnraBdFBx8pwYh7By2gVZURQ==",
       "dev": true,
       "engines": {
         "node": ">=8.17.0"
@@ -90,14 +90,14 @@
       }
     },
     "node_modules/@blockly/dev-tools": {
-      "version": "7.1.5",
-      "resolved": "https://registry.npmjs.org/@blockly/dev-tools/-/dev-tools-7.1.5.tgz",
-      "integrity": "sha512-eNpi+yknoR2RXzYUOE4Owp5XiY9Qm/FH+BOGhd5WrDyK3/LGQ4Yp0NOBO1tWN+Kbjxe19k6yhA50kX7YkDad/w==",
+      "version": "7.1.7",
+      "resolved": "https://registry.npmjs.org/@blockly/dev-tools/-/dev-tools-7.1.7.tgz",
+      "integrity": "sha512-ar/6A7JyTSzhJ6ojEOzoCxnm4jRTQJeYn87g+iTEJrM9K8tk/Ccn4sZY34T+ULhy8A2MbFkbtmERCLx6HNrAkA==",
       "dev": true,
       "dependencies": {
-        "@blockly/block-test": "^5.0.4",
+        "@blockly/block-test": "^5.1.0",
         "@blockly/theme-dark": "^6.0.5",
-        "@blockly/theme-deuteranopia": "^5.0.5",
+        "@blockly/theme-deuteranopia": "^5.0.6",
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+      "version": "7.3.1",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/types/-/types-7.3.1.tgz",
+      "integrity": "sha512-2tUf3uWggBDl4S4183nivWQ2HqceOZh1U4hhu4p1tPiIJoRRXrab7Y+Y0p+dozYwZVvLPRI6r5wKe9kToF9FIw==",
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-      "peer": true,
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+        "node": "^18.18.0 || >=20.0.0"
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@@ -1239,96 +1230,13 @@
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-        "@typescript-eslint/visitor-keys": "6.1.0",
-        "debug": "^4.3.4",
-        "globby": "^11.1.0",
-        "is-glob": "^4.0.3",
-        "semver": "^7.5.4",
-        "ts-api-utils": "^1.0.1"
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-        "url": "https://opencollective.com/typescript-eslint"
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-        "url": "https://opencollective.com/typescript-eslint"
-      }
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-      "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-6.19.0.tgz",
-      "integrity": "sha512-o/zefXIbbLBZ8YJ51NlkSAt2BamrK6XOmuxSR3hynMIzzyMY33KuJ9vuMdFSXW+H0tVvdF9qBPTHA91HDb4BIQ==",
-      "dev": true,
-      "dependencies": {
-        "@typescript-eslint/types": "6.19.0",
-        "@typescript-eslint/visitor-keys": "6.19.0",
+        "@typescript-eslint/types": "7.3.1",
+        "@typescript-eslint/visitor-keys": "7.3.1",
         "debug": "^4.3.4",
         "globby": "^11.1.0",
         "is-glob": "^4.0.3",
@@ -1337,7 +1245,7 @@
         "ts-api-utils": "^1.0.1"
       },
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-        "node": "^16.0.0 || >=18.0.0"
+        "node": "^18.18.0 || >=20.0.0"
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@@ -1349,24 +1257,7 @@
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-      "dev": true,
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-        "eslint-visitor-keys": "^3.4.1"
-      },
-      "engines": {
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-      },
-      "funding": {
-        "type": "opencollective",
-        "url": "https://opencollective.com/typescript-eslint"
-      }
-    },
-    "node_modules/@typescript-eslint/utils/node_modules/brace-expansion": {
+    "node_modules/@typescript-eslint/typescript-estree/node_modules/brace-expansion": {
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       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.0.1.tgz",
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@@ -1375,7 +1266,7 @@
         "balanced-match": "^1.0.0"
       }
     },
-    "node_modules/@typescript-eslint/utils/node_modules/minimatch": {
+    "node_modules/@typescript-eslint/typescript-estree/node_modules/minimatch": {
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@@ -1390,18 +1281,42 @@
         "url": "https://github.com/sponsors/isaacs"
       }
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-    "node_modules/@typescript-eslint/visitor-keys": {
-      "version": "6.1.0",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/visitor-keys/-/visitor-keys-6.1.0.tgz",
-      "integrity": "sha512-yQeh+EXhquh119Eis4k0kYhj9vmFzNpbhM3LftWQVwqVjipCkwHBQOZutcYW+JVkjtTG9k8nrZU1UoNedPDd1A==",
+    "node_modules/@typescript-eslint/utils": {
+      "version": "7.3.1",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/utils/-/utils-7.3.1.tgz",
+      "integrity": "sha512-jIERm/6bYQ9HkynYlNZvXpzmXWZGhMbrOvq3jJzOSOlKXsVjrrolzWBjDW6/TvT5Q3WqaN4EkmcfdQwi9tDjBQ==",
       "dev": true,
-      "peer": true,
       "dependencies": {
-        "@typescript-eslint/types": "6.1.0",
+        "@eslint-community/eslint-utils": "^4.4.0",
+        "@types/json-schema": "^7.0.12",
+        "@types/semver": "^7.5.0",
+        "@typescript-eslint/scope-manager": "7.3.1",
+        "@typescript-eslint/types": "7.3.1",
+        "@typescript-eslint/typescript-estree": "7.3.1",
+        "semver": "^7.5.4"
+      },
+      "engines": {
+        "node": "^18.18.0 || >=20.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/typescript-eslint"
+      },
+      "peerDependencies": {
+        "eslint": "^8.56.0"
+      }
+    },
+    "node_modules/@typescript-eslint/visitor-keys": {
+      "version": "7.3.1",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/visitor-keys/-/visitor-keys-7.3.1.tgz",
+      "integrity": "sha512-9RMXwQF8knsZvfv9tdi+4D/j7dMG28X/wMJ8Jj6eOHyHWwDW4ngQJcqEczSsqIKKjFiLFr40Mnr7a5ulDD3vmw==",
+      "dev": true,
+      "dependencies": {
+        "@typescript-eslint/types": "7.3.1",
         "eslint-visitor-keys": "^3.4.1"
       },
       "engines": {
-        "node": "^16.0.0 || >=18.0.0"
+        "node": "^18.18.0 || >=20.0.0"
       },
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@@ -4464,9 +4379,9 @@
       "dev": true
     },
     "node_modules/fast-glob": {
-      "version": "3.3.1",
-      "resolved": "https://registry.npmjs.org/fast-glob/-/fast-glob-3.3.1.tgz",
-      "integrity": "sha512-kNFPyjhh5cKjrUltxs+wFx+ZkbRaxxmZ+X0ZU31SOsxCEtP9VPgtq2teZw1DebupL5GmDaNQ6yKMMVcM41iqDg==",
+      "version": "3.3.2",
+      "resolved": "https://registry.npmjs.org/fast-glob/-/fast-glob-3.3.2.tgz",
+      "integrity": "sha512-oX2ruAFQwf/Orj8m737Y5adxDQO0LAB7/S5MnxCdTNDd4p6BsyIVsv9JQsATbTSq8KHRpLwIHbVlUNatxd+1Ow==",
       "dev": true,
       "dependencies": {
         "@nodelib/fs.stat": "^2.0.2",
@@ -6717,9 +6632,9 @@
       }
     },
     "node_modules/ip": {
-      "version": "1.1.8",
-      "resolved": "https://registry.npmjs.org/ip/-/ip-1.1.8.tgz",
-      "integrity": "sha512-PuExPYUiu6qMBQb4l06ecm6T6ujzhmh+MeJcW9wa89PoAz5pvd4zPgN5WJV104mb6S2T1AwNIAaB70JNrLQWhg==",
+      "version": "1.1.9",
+      "resolved": "https://registry.npmjs.org/ip/-/ip-1.1.9.tgz",
+      "integrity": "sha512-cyRxvOEpNHNtchU3Ln9KC/auJgup87llfQpQ+t5ghoC/UhL16SWzbueiCsdTnWmqAWl7LadfuwhlqmtOaqMHdQ==",
       "dev": true
     },
     "node_modules/is-absolute": {
@@ -10256,9 +10171,9 @@
       }
     },
     "node_modules/socks/node_modules/ip": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/ip/-/ip-2.0.0.tgz",
-      "integrity": "sha512-WKa+XuLG1A1R0UWhl2+1XQSi+fZWMsYKffMZTTYsiZaUD8k2yDAj5atimTUD2TZkyCkNEeYE5NhFZmupOGtjYQ==",
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/ip/-/ip-2.0.1.tgz",
+      "integrity": "sha512-lJUL9imLTNi1ZfXT+DU6rBBdbiKGBuay9B6xGSPVjUeQwaH1RIGqef8RZkUtHioLmSNpPR5M4HVKJGm1j8FWVQ==",
       "dev": true
     },
     "node_modules/source-map": {
@@ -10954,12 +10869,12 @@
       }
     },
     "node_modules/ts-api-utils": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/ts-api-utils/-/ts-api-utils-1.0.1.tgz",
-      "integrity": "sha512-lC/RGlPmwdrIBFTX59wwNzqh7aR2otPNPR/5brHZm/XKFYKsfqxihXUe9pU3JI+3vGkl+vyCoNNnPhJn3aLK1A==",
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/ts-api-utils/-/ts-api-utils-1.3.0.tgz",
+      "integrity": "sha512-UQMIo7pb8WRomKR1/+MFVLTroIvDVtMX3K6OUir8ynLyzB8Jeriont2bTAtmNPa1ekAgN7YPDyf6V+ygrdU+eQ==",
       "dev": true,
       "engines": {
-        "node": ">=16.13.0"
+        "node": ">=16"
       },
       "peerDependencies": {
         "typescript": ">=4.2.0"
@@ -11017,9 +10932,9 @@
       "dev": true
     },
     "node_modules/typescript": {
-      "version": "5.4.2",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.4.2.tgz",
-      "integrity": "sha512-+2/g0Fds1ERlP6JsakQQDXjZdZMM+rqpamFZJEKh4kwTIn3iDkgKtby0CeNd5ATNZ4Ry1ax15TMx0W2V+miizQ==",
+      "version": "5.4.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.4.3.tgz",
+      "integrity": "sha512-KrPd3PKaCLr78MalgiwJnA25Nm8HAmdwN3mYUYZgG/wizIo9EainNVQI9/yDavtVFRN2h3k8uf3GLHuhDMgEHg==",
       "dev": true,
       "bin": {
         "tsc": "bin/tsc",
diff --git a/package.json b/package.json
index d5f89e91d..ac70b3eeb 100644
--- a/package.json
+++ b/package.json
@@ -102,7 +102,7 @@
     "@hyperjump/json-schema": "^1.5.0",
     "@microsoft/api-documenter": "^7.22.4",
     "@microsoft/api-extractor": "^7.29.5",
-    "@typescript-eslint/eslint-plugin": "^6.1.0",
+    "@typescript-eslint/eslint-plugin": "^7.3.1",
     "async-done": "^2.0.0",
     "chai": "^4.2.0",
     "concurrently": "^8.0.1",
diff --git a/scripts/i18n/js_to_json.py b/scripts/i18n/js_to_json.py
index c070f3408..53651935e 100755
--- a/scripts/i18n/js_to_json.py
+++ b/scripts/i18n/js_to_json.py
@@ -81,7 +81,7 @@ def main():
   for line in infile:
     if line.startswith('///'):
       if description:
-        description = description + ' ' + line[3:].strip()
+        description += ' ' + line[3:].strip()
       else:
         description = line[3:].strip()
     else:
diff --git a/scripts/migration/renamings.json5 b/scripts/migration/renamings.json5
index bdbb2a132..9c51b2d4a 100644
--- a/scripts/migration/renamings.json5
+++ b/scripts/migration/renamings.json5
@@ -45,7 +45,7 @@
         // The name that the export had before this version.
         // All of the properties on this object are optional.
         'oldExportName': {
-          // The new module that the export is in in this version.  If
+          // The new module that the export is in this version.  If
           // this is not provided, the newModule is assumed to be the
           // parent module's newPath.
           newModule: 'new.module.name',
diff --git a/tests/generators/golden/generated.js b/tests/generators/golden/generated.js
index 7601cbdda..9fa4f1d93 100644
--- a/tests/generators/golden/generated.js
+++ b/tests/generators/golden/generated.js
@@ -513,7 +513,7 @@ function mathModes(values) {
   }
   for (var j = 0; j < counts.length; j++) {
     if (counts[j][1] === maxCount) {
-        modes.push(counts[j][0]);
+      modes.push(counts[j][0]);
     }
   }
   return modes;
@@ -527,7 +527,7 @@ function mathStandardDeviation(numbers) {
   for (var j = 0; j < n; j++) {
     variance += Math.pow(numbers[j] - mean, 2);
   }
-  variance = variance / n;
+  variance /= n;
   return Math.sqrt(variance);
 }
 
diff --git a/tests/generators/unittest_dart.js b/tests/generators/unittest_dart.js
index 312a8fcc2..89f355389 100644
--- a/tests/generators/unittest_dart.js
+++ b/tests/generators/unittest_dart.js
@@ -154,7 +154,7 @@ dartGenerator.forBlock['unittest_adjustindex'] = function(block) {
       return [Number(index) + 1, dartGenerator.ORDER_ATOMIC];
     } else {
       // If the index is dynamic, adjust it in code.
-      index = index + ' + 1';
+      index += ' + 1';
     }
   } else if (Blockly.utils.string.isNumber(index)) {
     return [index, dartGenerator.ORDER_ATOMIC];
diff --git a/tests/generators/unittest_javascript.js b/tests/generators/unittest_javascript.js
index 279244eb2..77953a37a 100644
--- a/tests/generators/unittest_javascript.js
+++ b/tests/generators/unittest_javascript.js
@@ -158,7 +158,7 @@ javascriptGenerator.forBlock['unittest_adjustindex'] = function(block) {
       return [Number(index) + 1, javascriptGenerator.ORDER_ATOMIC];
     } else {
       // If the index is dynamic, adjust it in code.
-      index = index + ' + 1';
+      index += ' + 1';
     }
   } else if (Blockly.utils.string.isNumber(index)) {
     return [index, javascriptGenerator.ORDER_ATOMIC];
diff --git a/tests/generators/unittest_php.js b/tests/generators/unittest_php.js
index 408960d82..aedd7e6a1 100644
--- a/tests/generators/unittest_php.js
+++ b/tests/generators/unittest_php.js
@@ -145,7 +145,7 @@ phpGenerator.forBlock['unittest_adjustindex'] = function(block) {
       return [Number(index) + 1, phpGenerator.ORDER_ATOMIC];
     } else {
       // If the index is dynamic, adjust it in code.
-      index = index + ' + 1';
+      index += ' + 1';
     }
   } else if (Blockly.utils.string.isNumber(index)) {
     return [index, phpGenerator.ORDER_ATOMIC];
diff --git a/tests/generators/unittest_python.js b/tests/generators/unittest_python.js
index ba29015f9..49f8c9100 100644
--- a/tests/generators/unittest_python.js
+++ b/tests/generators/unittest_python.js
@@ -129,7 +129,7 @@ pythonGenerator.forBlock['unittest_adjustindex'] = function(block) {
       return [Number(index) + 1, pythonGenerator.ORDER_ATOMIC];
     } else {
       // If the index is dynamic, adjust it in code.
-      index = index + ' + 1';
+      index += ' + 1';
     }
   } else if (Blockly.utils.string.isNumber(index)) {
     return [index, pythonGenerator.ORDER_ATOMIC];
diff --git a/tests/mocha/registry_test.js b/tests/mocha/registry_test.js
index fd37c6e69..b562606f4 100644
--- a/tests/mocha/registry_test.js
+++ b/tests/mocha/registry_test.js
@@ -47,6 +47,15 @@ suite('Registry', function () {
     test('Overwrite a Key', function () {
       Blockly.registry.register('test', 'test_name', TestClass);
       chai.assert.throws(function () {
+        // Registers a different object under the same name
+        Blockly.registry.register('test', 'test_name', {});
+      }, 'already registered');
+    });
+
+    test('Register a Duplicate Item', function () {
+      Blockly.registry.register('test', 'test_name', TestClass);
+      chai.assert.doesNotThrow(function () {
+        // Registering the same object under the same name is allowed
         Blockly.registry.register('test', 'test_name', TestClass);
       }, 'already registered');
     });
diff --git a/tests/scripts/load.mjs b/tests/scripts/load.mjs
index 728a4fd2c..f2238cf1c 100644
--- a/tests/scripts/load.mjs
+++ b/tests/scripts/load.mjs
@@ -68,7 +68,7 @@ export const COMPRESSED = compressed();
  *
  * When loading in uncompressed mode, if scriptExports is a simple
  * variable name (e.g. 'Blockly') then globalThis[scriptExports] will
- * be set to the the chunk's Module object.  This attempts to provide
+ * be set to the chunk's Module object.  This attempts to provide
  * backward compatibility with loading the compressed chunk as a
  * script, where this is done by the compressed chunk's UMD wrapper.
  * The compatibility is not complete, however: since Module objects